• Tulsa
  • Mongolian Autonomous County of Subei

Tulsa (/ˈtʌlsə/) is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with 1,023,988 residents. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, with urban development extending into Osage, Rogers, and Wagoner counties.

Tulsa was settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe and most of Tulsa is still part of the territory of the Muscogee (Creek) Nation.[a]

Historically, a robust energy sector fueled Tulsa's economy; however, today the city has diversified and leading sectors include finance, aviation, telecommunications and technology. Two institutions of higher education within the city have sports teams at the NCAA Division I level: Oral Roberts University and the University of Tulsa. As well, the University of Oklahoma has a secondary campus at the Tulsa Schusterman Center, and Oklahoma State University has a secondary campus located in downtown Tulsa. For most of the 20th century, the city held the nickname "Oil Capital of the World" and played a major role as one of the most important hubs for the American oil industry.

Subei Mongolian Autonomous County, which is under the jurisdiction of Jiuquan City, is located in the northwest of Gansu Province, on the north and south sides of the western end of the Hexi Corridor. The county is divided into two disconnected areas, Nanshan and Beishan, with a total area of 66748 square kilometers. it is bordered by three counties and cities of one country and three provinces (regions). It has jurisdiction over 2 towns and 2 townships, with a total population of 11741 (2012), of which 4446 are Mongolian, accounting for 37.9%. Subei County had nomadic activities in the pre-Qin period; in the Western Han Dynasty, it was incorporated into the territory of the Central Plains Dynasty, belonging to Dunhuang County; after the continuous war, the ownership was changed repeatedly, the local regime and nomadic sphere of influence were crisscross, and the control of the central regime was weak. It belongs to Gansu Province since the Qing Dynasty, and Subei Bureau was set up in the Republic of China in twenty-five years (1937). Liberation in July 1950, 19
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